Over the last few days, hundreds of thousands of Ukrainians have swarmed the streets of Kiev and other cities to protest against the government's decision to back away from a deal with the European Union on Nov. 21. The deal would have established political and free trade agreements between the EU and the Ukraine, a former Soviet republic, and it faced strong opposition from Russia.
The decision by Ukranian President Viktor Yanukovych spurred pro-European protesters to take to the streets, and the movement has gained steam by the day. On Nov. 24, estimates put 100,000 people in the streets. By Tuesday, that number had swelled to 1 million, according to The New York Times.
See also: Boxing Brothers Swept Up in Ukraine Revolutionary Fervor
Initially, the protesters demanded the president reverse his decision but, after he refused to do so, they began asking for his resignation. The movement has been joined by Ukraine's top boxer, Vitali Klitschko, who's now eyeing the presidency.
Below, we've collected some of the most compelling images coming out of the protests.
Ukrainian protesters wave a European Union (EU) flag as thousands gather for a pro-EU opposition rally at Independence Square in Kiev.
A protester throws a stone during the storming of the Viktor Yanukovych presidential office in Kiev during a mass rally of the opposition.
Pro-European Ukrainian demonstrators steer a bulldozer in front of police barricades protecting the presidential administration office in Kiev.
A molotov cocktail explodes in front of police officers during clashes with pro-European Ukrainian demonstrators near the presidential administration office in Kiev.
A protester with a chain clashes with police during the storming of the Viktor Yanukovych presidential office in Kiev.
Ukrainian protesters clash with riot policemen outside the Ukrainian president's office in Kiev.
Pro-European Ukrainian demonstrators spray tear gas on police members protecting the presidential administration office in Kiev.
A girl wearing glasses reading "Power closes my eyes. I am not a slave," takes part in a march in the western Ukrainian city of Lviv.
A pro-European Ukrainian demonstrator waves a flag in front of members of the riot police.
A human wall of Ukrainian police blocks the street in front of the presidential office in Kiev.
A protesters gets his picture taken near a lit billboard featuring a defaced portrait of Ukrainian President Viktor Yanukovych in the center of Kiev.
An elderly Ukrainian faces riot police as thousands rally outside the Ukrainian parliament in Kiev.
Young protesters with faces painted the colors of Ukrainian and Eeropean Union flags kiss each other at a tent camp on Independence Square in Kiev.
A view of protesters rallying in Independence Square in Kiev.
Opposition protesters warm themselves early at a tent camp on Independence Square in Kiev.
Pro-European protesters take part in the blockade of the Ukrainian Cabinet of Ministers in Kiev.
A man serves soup to anti-government protesters in Independence Square in Kiev.
Anti-government protesters rest on the floor in the occupied City Hall building in Kiev.
Anti-government protesters sleep on the floor in the occupied City Hall building in Kiev.
Protesters look out over an anti-government rally in Independence Square in Kiev.
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Image: Brendan Hoffman/Getty Images